1 #ifndef __NR_FILTER_GAUSSIAN_H__
2 #define __NR_FILTER_GAUSSIAN_H__
4 /*
5 * Gaussian blur renderer
6 *
7 * Authors:
8 * Niko Kiirala <niko@kiirala.com>
9 * bulia byak
10 * Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
11 *
12 * Copyright (C) 2006 authors
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 */
17 #include "display/nr-filter-primitive.h"
18 #include "display/nr-filter-slot.h"
19 #include "display/nr-filter-units.h"
20 #include "libnr/nr-pixblock.h"
21 #include "libnr/nr-matrix.h"
22 #include "libnr/nr-rect-l.h"
24 enum {
25 BLUR_QUALITY_BEST = 2,
26 BLUR_QUALITY_BETTER = 1,
27 BLUR_QUALITY_NORMAL = 0,
28 BLUR_QUALITY_WORSE = -1,
29 BLUR_QUALITY_WORST = -2
30 };
32 namespace NR {
34 class FilterGaussian : public FilterPrimitive {
35 public:
36 FilterGaussian();
37 static FilterPrimitive *create();
38 virtual ~FilterGaussian();
40 virtual int render(FilterSlot &slot, FilterUnits const &units);
41 virtual void area_enlarge(NRRectL &area, Matrix const &m);
42 virtual FilterTraits get_input_traits();
44 /**
45 * Set the standard deviation value for gaussian blur. Deviation along
46 * both axis is set to the provided value.
47 * Negative value, NaN and infinity are considered an error and no
48 * changes to filter state are made. If not set, default value of zero
49 * is used, which means the filter results in transparent black image.
50 */
51 void set_deviation(double deviation);
52 /**
53 * Set the standard deviation value for gaussian blur. First parameter
54 * sets the deviation alogn x-axis, second along y-axis.
55 * Negative value, NaN and infinity are considered an error and no
56 * changes to filter state are made. If not set, default value of zero
57 * is used, which means the filter results in transparent black image.
58 */
59 void set_deviation(double x, double y);
61 private:
62 double _deviation_x;
63 double _deviation_y;
64 };
67 } /* namespace NR */
72 #endif /* __NR_FILTER_GAUSSIAN_H__ */
73 /*
74 Local Variables:
75 mode:c++
76 c-file-style:"stroustrup"
77 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
78 indent-tabs-mode:nil
79 fill-column:99
80 End:
81 */
82 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :